Manipulation Game.

P.S. the reason for the warning, is because the book is about. well as you can see., manipulation. but this is also because the story has dark pasts, and other themes.
*Hiatus—Coming Back Soon*
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The story follows Kōgōshī Satsujin-sha, as he plays the game "Friend Game". Which is also titled... Manipulation Game, a game with a set of 10 types!

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So now you're intrigued? Well... Let's see how his friends And Kōgōshī himself, lose. Their. Friendship.